1223145555 has 16 divisors (see below), whose sum is σ = 1957528320. Its totient is φ = 652179168.

The previous prime is 1223145551. The next prime is 1223145647. The reversal of 1223145555 is 5555413221.

1223145555 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1223145555 - 2² = 1223145551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1223145551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72186 + ... + 87504.

It is an arithmetic number, because the mean of its divisors is an integer number (122345520).

Almost surely, 2^1223145555 is an apocalyptic number.

1223145555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1223145555 is a deficient number, since it is larger than the sum of its proper divisors (734382765).

1223145555 is a wasteful number, since it uses less digits than its factorization.

1223145555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20650.

The product of its digits is 30000, while the sum is 33.

The square root of 1223145555 is about 34973.4978948346. The cubic root of 1223145555 is about 1069.4472805537.

Adding to 1223145555 its reverse (5555413221), we get a palindrome (6778558776).

The spelling of 1223145555 in words is "one billion, two hundred twenty-three million, one hundred forty-five thousand, five hundred fifty-five".